Method and device for forming a longitudinal fibre web

D - Textiles – Paper – 04 – H

Patent

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Details

D04H 3/04 (2006.01) B29C 70/22 (2006.01) B32B 5/12 (2006.01) B65H 23/04 (2006.01) B65H 39/16 (2006.01) D04H 13/00 (2006.01)

Patent

CA 2404935

The invention describes a method and a device (101) for producing a longitudinal fibre web (100), in which fibres (2) are continuously applied, in the longitudinal direction, to a substrate web (6). In a pretreatment section, a relatively high tensile force (F) has to be exerted on the fibres, resulting in a relatively great strain (.epsilon.). Before the fibres (2) are applied to the substrate web (6), the stress in the fibres is reduced. The drive for the fibres in the pretreatment section is separate from the drive for the substrate web, the transport velocity of the fibres in the pretreatment section being controlled separately as a function of the transport velocity of the substrate web, in such a manner that the transport velocity of the fibres in the relaxed state is substantially equal to the transport velocity of the substrate web in the relaxed state. The result is a longitudinal fibre web (100) which is substantially free of length differences and stress differences between the fibres (2) and the substrate web (6).

L'invention concerne un procédé et un dispositif (101) destinés à produire une bande fibreuse longitudinale (100), procédé selon lequel des fibres (102) sont appliquées de manière continue dans le sens de la longueur à une bande substrat (6). Dans une zone de prétraitement, une force de tension relativement élevée (F) doit être exercée sur les fibres, entraînant une déformation ( epsilon ) relativement importante. Avant que les fibres (2) ne soient appliquées à la bande substrat (6), la contrainte des fibres est réduite. L'entraînement des fibres dans la zone de prétraitement est séparé de l'entraînement de la bande substrat, la vitesse de transport des fibres dans la zone de prétraitement étant commandée séparément en fonction de la vitesse de transport de la bande substrat, de manière que la vitesse de transport des fibres à l'état relâché soit sensiblement égale à celle de la bande substrat à l'état relâché. Une bande fibreuse longitudinale (100) est ainsi produite, qui ne présente quasiment aucune différence de longueurs et de contraintes entre les fibres (2) et la bande substrat (6).

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